Kimi-Dev and GPT-5 Pro don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi-Dev shipped 67 days before GPT-5 Pro, so benchmark comparisons should account for the intervening progress.

Kimi-Dev is open weight, while GPT-5 Pro is proprietary.

Direct benchmark comparisons are unavailable — Kimi-Dev and GPT-5 Pro don't publish scores on any of the same benchmarks.